cdrwtool wait_cmd: no medium found

I have redhat 2.4.7-10 with udf write support. I have tried a variety of CDRW and get the same eror when formating cdrwtool -d /dev/scd0 -q ... initiating quick disc blank wait_cmd: no medium found Command failed: a1 01 00 00 00 00 00... - sense 02.04.01 blank disc: Illegal seek I can cdrecord onto the same disk immediately after fasilure with no problem The messages log shows numerous attempts to reach hdc and sr0, and errors are timeout and CDROM not ready yet I tried commenting out /etc/fstab /dev/cdrom /mnt/cdrom iso9660 noauto and inserting /dev/scd0 /mnt/cdrw udf noauto,owner 0 0 did not help I tried inserting alias scd0 sr_mod in /etc/modules.conf, did not help Any help appreciated rfjones